Very generally speaking, comics from the mid-1970s on up don't sell for much anymore - usually 25 to 75 cents each, unless they're in exceptional condition (meaning slabbed or slabbable) or some kind of "key" or 1st issue.

If you go to mycomicshop.com, you can look up a few under their "Sell Comics" tab - that will give you an idea of demand. If they're not buying, it usually means the book is low demand/low value. If they are buying, their prices are pretty close to what you can get on eBay (net of selling expenses), and almost always better than what you can get from local comics stores.

You can also check under their "Buy Comics" tab and see what they're selling your comics for, but keep in mind that as a retailer their sell prices are probably 2 to 4 times what you can expect to get on eBay or elsewhere. I looked at Kull, for example, and except for the earliest issues it looks like mycomicshop.com sells them for $1-$2 in 5.0-6.0 condition, putting them at around $0.50 wholesale.